Also, B12 deficiency can affect the efficiency of the heart. It did in my case, and although I didn't develop blue fingernails, I did develop an inability to function mentally after walking a bit.

Thank goodness, that and the tachycardia and panic attacks stopped within a year of treatment.

As one researcher/writer stated: "B12 deficiency affects every cell in the body," and since we have different genetic makeups, different environments, etc., it affects us in different ways and to different degrees early or late in untreated deficiency.

rose